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From "Andrew Wang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-10689) "hdfs dfs -chmod 777" does not remove sticky bit
Date Tue, 26 Jul 2016 17:59:20 GMT

    [ https://issues.apache.org/jira/browse/HDFS-10689?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15394212#comment-15394212
] 

Andrew Wang commented on HDFS-10689:
------------------------------------

Thanks for digging into this Manoj. I'm of the opinion that we should try to imitate the Linux/BSD
behavior, since that'll be least surprising to end users.

Now the question is if we declare this a bug fix that can be backported to branch-2, or if
this behavior change is too incompatible. Given that sticky bits are pretty rare in general,
I think it's safe for branch-2, but would welcome other's thoughts. Anything to add [~cnauroth]?

> "hdfs dfs -chmod 777" does not remove sticky bit
> ------------------------------------------------
>
>                 Key: HDFS-10689
>                 URL: https://issues.apache.org/jira/browse/HDFS-10689
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: fs
>            Reporter: Manoj Govindassamy
>            Assignee: Manoj Govindassamy
>            Priority: Minor
>
> When a directory permission is modified using hdfs dfs chmod command and when octal/numeric
format is used, the leading sticky bit is not fully honored.
> 1. Create a dir dir_test_with_sticky_bit
> 2. Apply sticky bit permission on the dir : hdfs dfs -chmod 1755 /dir_test_with_sticky_bit
> 3. Remove sticky bit permission on the dir: hdfs dfs -chmod 755 /dir_test_with_sticky_bit
> Expected: Remove the sticky bit on the dir, as it happens on Mac/Linux native filesystem
with native chmod.
> 4. However, removing sticky bit permission by explicitly turning off the bit works. hdfs
dfs -chmod 0755 /dir_test_with_sticky_bit
> {noformat}
> manoj@~/work/hadev-pp: hdfs dfs -chmod 1755 /dir_test_with_sticky_bit
> manoj@~/work/hadev-pp: hdfs dfs -ls /
> Found 2 items
> drwxr-xr-t   - manoj supergroup          0 2016-07-25 11:42 /dir_test_with_sticky_bit
> drwxr-xr-x   - manoj supergroup          0 2016-07-25 11:42 /user
> manoj@~/work/hadev-pp: hdfs dfs -chmod 755 /dir_test_with_sticky_bit
> manoj@~/work/hadev-pp: hdfs dfs -ls /
> Found 2 items
> drwxr-xr-t   - manoj supergroup          0 2016-07-25 11:42 /dir_test_with_sticky_bit
 <=== sticky bit still intact
> drwxr-xr-x   - manoj supergroup          0 2016-07-25 11:42 /user
> manoj@~/work/hadev-pp: hdfs dfs -chmod 0755 /dir_test_with_sticky_bit
> manoj@~/work/hadev-pp: hdfs dfs -ls /
> Found 2 items
> drwxr-xr-x   - manoj supergroup          0 2016-07-25 11:42 /dir_test_with_sticky_bit
> drwxr-xr-x   - manoj supergroup          0 2016-07-25 11:42 /user
> manoj@~/work/hadev-pp: 
> {noformat}



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